The move came less than 24 hours after the Ravens scored only one touchdown in a 16-10 loss to Washington.

"I just think we need a different chemistry in there right now to get to where we need to go," Harbaugh said.

"I think we all know what it needs to look like. It's what plays get called in certain situations, but it's also the physicality of our offense, it's the attack-mentality of our offense, it's how we go about our business. Those are things that just weren't getting there."

The Ravens (3-2) performed miserably on offense against the Redskins, who entered with the 29th-ranked defense in the NFL.

After scoring a touchdown on its opening drive, Baltimore added a field goal in the second quarter and was blanked in the second half.

During one stretch, the Ravens had seven straight possessions that lasted four plays or fewer. Trestman inexplicably abandoned the running game in the second half, even though Baltimore was averaging 5.7 yards per carry over the opening 30 minutes.

"When you go back and look at it, I feel like we were running the ball well enough to run the ball a lot more than we did," Harbaugh said.

Trestman was in his second season as Baltimore's offensive coordinator. Last season, the Ravens had the second-most total net yards in team history but went 5-11.

This is the second time during Harbaugh's nine-year run in Baltimore that he fired his offensive coordinator in the middle of the season.

In 2012, he dismissed Cam Cameron after a loss to the Redskins and the Ravens ended up winning the Super Bowl.

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There's no guarantee that will happen again. But, as in that situation, Harbaugh knew it was time to make a change.

"It's more about direction. It's a big-picture type of a feel thing," Harbaugh said.

Mornhinweg, 54, joined the Ravens as quarterbacks coach in 2015. Prior to that, he spent the 2013-14 seasons as offensive coordinator of the New York Jets. He was head coach of the Detroit Lions in 2001-02 before working as offensive coordinator of the Eagles from 2004-12.

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This story has been automatically published from the Associated Press wire which uses US spellings